Building material



FIG. 1 is an upper left perspective view of a building material according to my design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof, the bottom view corresponding thereto;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof. 

The ornamental design for a building material, as shown and described. 